I just picked up a DSLR not too long ago and I mainly shoot cars but I'm having a hard time capturing sharp images. Has anyone tried the free guide on www.learntoshootcars.com ? I found it on Google and I'm tempted to give it a shot. Anyone have any tips or should I just download the guide?

getting sharper images doesn't specifically rely on car photography, rather than knowing your equipment and what lens and where that lens has it's sweet spot. all lenses are different, so google what lens you got and you'll get many many posts about the subject.